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[Gribouillis]

If you want to do something with the client, you need to keep a reference to the client, which is not the case here because your client is a local variable of the wrap() function.

The simplest way to interact is to send command lines to the client like so

stdin, stdout, stderr = client.exec_command(command) # <--- get the command from a form perhaps?
status = stdout.channel.recv_exit_status()
for line in stdout:
    print(line) # <--- or write the line to the text window instead

Another solution for a better simulation of interactive ssh sessions is probably to use the paramiko_expect module and try to print the messages sent and received as shown to the Tkinter text window.